From f39b7e97cec9ca3006b26f0b88b161628529c29a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?V=C3=ADctor=20Manuel=20J=C3=A1quez=20Leal?=
 <vjaquez@igalia.com>
Date: Wed, 14 Jun 2017 18:31:18 +0200
Subject: [PATCH] vaapidecode_props: h264: add low latency property

Adding support for private data.

https://bugzilla.gnome.org/show_bug.cgi?id=783588
---
 gst/vaapi/gstvaapidecode_props.c | 49 ++++++++++++++++++++++++++++++++
 gst/vaapi/gstvaapidecode_props.h | 10 +++++++
 2 files changed, 59 insertions(+)

diff --git a/gst/vaapi/gstvaapidecode_props.c b/gst/vaapi/gstvaapidecode_props.c
index 895a55e638..b93f06c4bf 100644
--- a/gst/vaapi/gstvaapidecode_props.c
+++ b/gst/vaapi/gstvaapidecode_props.c
@@ -23,21 +23,70 @@
 
 #include "gstvaapidecode_props.h"
 
+enum
+{
+  GST_VAAPI_DECODER_H264_PROP_FORCE_LOW_LATENCY = 1,
+};
+
+static gint h264_private_offset;
+
 static void
 gst_vaapi_decode_h264_get_property (GObject * object, guint prop_id,
     GValue * value, GParamSpec * pspec)
 {
+  GstVaapiDecodeH264Private *priv;
+
+  priv = gst_vaapi_decode_h264_get_instance_private (object);
+
+  switch (prop_id) {
+    case GST_VAAPI_DECODER_H264_PROP_FORCE_LOW_LATENCY:
+      g_value_set_boolean (value, priv->is_low_latency);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
 }
 
 static void
 gst_vaapi_decode_h264_set_property (GObject * object, guint prop_id,
     const GValue * value, GParamSpec * pspec)
 {
+  GstVaapiDecodeH264Private *priv;
+
+  priv = gst_vaapi_decode_h264_get_instance_private (object);
+
+  switch (prop_id) {
+    case GST_VAAPI_DECODER_H264_PROP_FORCE_LOW_LATENCY:
+      priv->is_low_latency = g_value_get_boolean (value);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
 }
 
 void
 gst_vaapi_decode_h264_install_properties (GObjectClass * klass)
 {
+  h264_private_offset = sizeof (GstVaapiDecodeH264Private);
+  g_type_class_adjust_private_offset (klass, &h264_private_offset);
+
   klass->get_property = gst_vaapi_decode_h264_get_property;
   klass->set_property = gst_vaapi_decode_h264_set_property;
+
+  g_object_class_install_property (klass,
+      GST_VAAPI_DECODER_H264_PROP_FORCE_LOW_LATENCY,
+      g_param_spec_boolean ("low-latency", "Force low latency mode",
+          "When enabled, frames will be pushed as soon as they are available. "
+          "It might violate the H.264 spec.", FALSE,
+          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | G_PARAM_CONSTRUCT));
+}
+
+GstVaapiDecodeH264Private *
+gst_vaapi_decode_h264_get_instance_private (gpointer self)
+{
+  if (h264_private_offset == 0)
+    return NULL;
+  return (G_STRUCT_MEMBER_P (self, h264_private_offset));
 }
diff --git a/gst/vaapi/gstvaapidecode_props.h b/gst/vaapi/gstvaapidecode_props.h
index 3865c7791d..877754f7ad 100644
--- a/gst/vaapi/gstvaapidecode_props.h
+++ b/gst/vaapi/gstvaapidecode_props.h
@@ -28,9 +28,19 @@
 
 G_BEGIN_DECLS
 
+typedef struct _GstVaapiDecodeH264Private GstVaapiDecodeH264Private;
+
+struct _GstVaapiDecodeH264Private
+{
+  gboolean is_low_latency;
+};
+
 void
 gst_vaapi_decode_h264_install_properties (GObjectClass * klass);
 
+GstVaapiDecodeH264Private *
+gst_vaapi_decode_h264_get_instance_private (gpointer self);
+
 G_END_DECLS
 
 #endif /* GST_VAAPI_DECODE_PROPS_H */